Sites and apps similar to MxToolBox include Domain Digger, which is free and open source. Other options are Pingdom, HetrixTools, MailAegis and Klaxel. You're spoiled for choice with Uptime Monitor Services like MxToolBox: we list more than 50 alternatives for Windows, Linux, self-hosting, Chrome OS and Mac.
Silent Down is a website uptime and performance monitoring platform, to keep an eye on your application and instantly alert you if any issues arrive.
MailRadar is a Linux oriented community offering you free set of tools and latest news, articles and tutorials regarding mail servers and UNIX-like OS.
Proactively monitor your websites and online services. Receive immediate notification when a problem is detected so you can quickly resolve the root cause and prevent potential escalation.
Slovenia
EU
Enterprise infrastructure monitoring for email reputation, SSL certificates, and the services you can't afford to lose.
Canada
Real-time uptime monitoring for Shopify stores. Get instant alerts when Stripe, Klaviyo, ShipStation, or any of your 80+ e-commerce services goes down.
Unlimited monitors checked from multiple location every minute. Monitor any port or setup a "heartbeat" that works well for cron jobs or any service behind a firewall. Be alerted as soon as your service is offline via email or app integration.
ServersUp.net can check a number of different services on different hosts to make sure those services are up and running. It will send alerts when the statuses change.
Sender Policy Framework (SPF) is used to authenticate the sender of an email. With an SPF record in place, email providers can verify that a mail server is authorized to send email for a specific domain. You can Lookup or Generate the SPF record.
InboxGreen checks whether your emails reach the inbox or land in spam. Test SPF, DKIM and DMARC authentication records for any domain instantly, no account required.
Relaymetry is a free checker for email authentication and domain posture. Enter any domain and it inspects MX, SPF (expanding includes to show the real DNS-lookup count against the 10-lookup limit), DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, DNSBL blacklists, and TLS, then reports the...
